﻿/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.    
*/

namespace NVelocity.Tests
{
    using NUnit.Framework;

    /// <summary> Used to check that nulls are properly handled in #if statements</summary>
    [TestFixture]
    public class IfNullTestCase : BaseEvalTestCase
    {
        override protected internal VelocityContext Context
        {
            set
            {
                value.Put("nullToString", new NullToString());
                value.Put("notnull", new object());
            }

        }
      
        [Test]
        public virtual void testIfEquals()
        {
            // both null
            assertEvalEquals("foo", "#if( $null == $otherNull )foo#{else}bar#end");
            assertEvalEquals("foo", "#if( $null == $nullToString )foo#{else}bar#end");
            assertEvalEquals("foo", "#if( $nullToString == $null )foo#{else}bar#end");
            // left null, right not
            assertEvalEquals("bar", "#if( $nullToString == $notnull )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $null == $notnull )foo#{else}bar#end");
            // right null, left not
            assertEvalEquals("bar", "#if( $notnull == $nullToString )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $notnull == $null )foo#{else}bar#end");
        }

        [Test]
        public virtual void testIfNotEquals()
        {
            // both null
            assertEvalEquals("bar", "#if( $null != $otherNull )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $null != $nullToString )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $nullToString != $null )foo#{else}bar#end");
            // left null, right not
            assertEvalEquals("foo", "#if( $nullToString != $notnull )foo#{else}bar#end");
            assertEvalEquals("foo", "#if( $null != $notnull )foo#{else}bar#end");
            // right null, left not
            assertEvalEquals("foo", "#if( $notnull != $nullToString )foo#{else}bar#end");
            assertEvalEquals("foo", "#if( $notnull != $null )foo#{else}bar#end");
        }

        [Test]
        public virtual void testIfValue()
        {
            assertEvalEquals("bar", "#if( $null )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $nullToString )foo#{else}bar#end");
            assertEvalEquals("foo", "#if( !$null )foo#{else}bar#end");
            assertEvalEquals("foo", "#if( !$nullToString )foo#{else}bar#end");
        }

        [Test]
        public virtual void testIfAnd()
        {
            assertEvalEquals("bar", "#if( $null && $nullToString )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $nullToString && $null )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $null && $notnull )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $notnull && $nullToString )foo#{else}bar#end");
        }

        [Test]
        public virtual void testIfOr()
        {
            assertEvalEquals("bar", "#if( $null || $nullToString )foo#{else}bar#end");
            assertEvalEquals("bar", "#if( $nullToString || $null )foo#{else}bar#end");
            assertEvalEquals("foo", "#if( $null || $notnull )foo#{else}bar#end");
            assertEvalEquals("foo", "#if( $notnull || $nullToString )foo#{else}bar#end");
        }

        public class NullToString
        {
            public override string ToString()
            {
                return null;
            }
        }
    }
}
